EP0343342A1 - Fastener with an expanding sleeve - Google Patents

Fastener with an expanding sleeve Download PDF

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Publication number
EP0343342A1
EP0343342A1 EP89105407A EP89105407A EP0343342A1 EP 0343342 A1 EP0343342 A1 EP 0343342A1 EP 89105407 A EP89105407 A EP 89105407A EP 89105407 A EP89105407 A EP 89105407A EP 0343342 A1 EP0343342 A1 EP 0343342A1
Authority
EP
European Patent Office
Prior art keywords
expansion sleeve
sleeve
expanding sleeve
shaft
expansion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89105407A
Other languages
German (de)
French (fr)
Other versions
EP0343342B1 (en
Inventor
Artur Prof.Dr.H.C. Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fischerwerke Artur Fischer GmbH and Co KG
Original Assignee
Fischerwerke Artur Fischer GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fischerwerke Artur Fischer GmbH and Co KG filed Critical Fischerwerke Artur Fischer GmbH and Co KG
Priority to AT89105407T priority Critical patent/ATE68854T1/en
Publication of EP0343342A1 publication Critical patent/EP0343342A1/en
Application granted granted Critical
Publication of EP0343342B1 publication Critical patent/EP0343342B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
    • F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
    • F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
    • F16B13/065—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting the screw, nail or the like

Definitions

  • the invention relates to a fastener with an expansion sleeve according to the preamble of the main claim.
  • a fastening element with an expanding sleeve is known, which is suitable for self-clamping fastening in boreholes.
  • the fastening element has a shaft on which an expansion sleeve is placed, which in the unloaded state projects slightly beyond the shaft diameter.
  • the expansion sleeve can be compressed resiliently when inserted into a borehole, whereby it braces against the borehole wall. When driving in, the frictional force caused by the elastic tension must therefore be overcome. It can happen that the shaft part adjoining the expansion sleeve inadvertently pushes partially under the expansion sleeve, in particular when the expansion sleeve lies slightly tilted against the shoulder formed by this shaft part.
  • the invention has for its object to design the expansion sleeve designed as a spring sleeve so that it rests securely on the adjacent shaft part when driving into a borehole.
  • Inwardly angled tabs are formed on the expansion sleeve, which rest securely on a shoulder of the shaft when the fastening element is driven in.
  • the expansion sleeve is tapered in this area by the inwardly bent tabs, which ensures that the expansion sleeve does not overlap over the adjacent shoulder area of the shaft, even in the case of irregularly extending drill holes.
  • the inwardly bent tabs have the advantage that the expansion sleeve tries to bulge outwards when driven in due to the forces acting on the tabs, as a result of which better tensioning between the expansion sleeve and the borehole wall is achieved.
  • the expansion sleeve is thereby better centered when it is driven into the borehole, so that an undesired overlapping of the expansion sleeve over the shoulder region of the shaft is thereby also avoided.
  • the fastening element shown in FIG. 1 consists of a shaft 1 which has a threaded section 2 at its rear end for clamping an object and has a stepped section 3 in the front area, to which an expansion cone 4 adjoins at the end.
  • an expansion sleeve 5 made of spring steel is placed, which surrounds this section 3 with radial and axial play.
  • the expansion sleeve 5 has on the side shown in Figure 1 a continuous longitudinal slot 7, which allows a spring-elastic compression of the expansion sleeve 5.
  • FIG. 2 shows the complete longitudinal section of the expansion sleeve 5 shown in FIG. 1.
  • the spread has at the lower end sleeve 5 two opposite, inwardly bent tabs 8, 9, which abut a shoulder 10 of the shaft 1.
  • the expansion sleeve 5 has a slot 12 on its rear side, which, like the longitudinal slot 7, allows the expansion sleeve 5 to be expanded in the region of the expansion cone 4.
  • the expansion sleeve 5 is spread apart by pulling the expansion cone 4 into the expansion sleeve 5. This is done, for example, by first placing an object to be fastened with a hole on the threaded section 2, which protrudes from the borehole opening, and then screwing and tightening a screw nut.
  • the expansion cone 4 is pulled downwards, while the expansion sleeve 5 is clamped stationary in the borehole.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Piles And Underground Anchors (AREA)
  • Gloves (AREA)

Abstract

Fastening elements with an expanding sleeve (5) consisting of spring steel can be knocked into drillholes of a masonry, the expanding sleeve (5) being slightly compressed in terms of its diameter and thereby being braced relative to the drill hole wall. So that the expanding sleeve (5), when being knocked in, bears firmly against a shoulder (10) formed on the shank (1), a narrowing in the form of inwardly bent tabs (8, 9) is provided on the side of the expanding sleeve (5) against this shoulder (10). This at the same time improves the bracing of the expanding sleeve (5). <IMAGE>

Description

Die Erfindung betrifft ein Befestigungselement mit Spreizhülse gemäß der Gattung des Hauptanspruchs.The invention relates to a fastener with an expansion sleeve according to the preamble of the main claim.

Aus der DE-OS 35 26 784 ist ein Befestigungselement mit Spreizhülse bekannt, welches zur selbstklemmenden Befestigung in Bohrlöchern ge­eignet ist. Das Befestigungselement besitzt einen Schaft, auf den ei­ne Spreizhülse aufgesetzt ist, die im unbelasteten Zustand geringfügig über den Schaftdurchmesser übersteht. Die Spreizhülse läßt sich feder­elastisch beim Einsetzen in ein Bohrloch zusammendrücken, wobei sie sich mit der Bohrlochwand verspannt. Beim Einschlagen muß daher die durch die elastische Verspannung hervorgerufene Reibungskraft über­wunden werden. Dabei kann es vorkommen, daß der sich an die Spreiz­hülse anschließende Schaftteil ungewollt teilweise unter die Spreiz­hülse schiebt, insbesondere dann, wenn die Spreizhülse geringfügig ver­kantet an der von diesem Schaftteil gebildeten Schulter anliegt.From DE-OS 35 26 784 a fastening element with an expanding sleeve is known, which is suitable for self-clamping fastening in boreholes. The fastening element has a shaft on which an expansion sleeve is placed, which in the unloaded state projects slightly beyond the shaft diameter. The expansion sleeve can be compressed resiliently when inserted into a borehole, whereby it braces against the borehole wall. When driving in, the frictional force caused by the elastic tension must therefore be overcome. It can happen that the shaft part adjoining the expansion sleeve inadvertently pushes partially under the expansion sleeve, in particular when the expansion sleeve lies slightly tilted against the shoulder formed by this shaft part.

Der Erfindung liegt die Aufgabe zugrunde, die als Federhülse ausge­bildete Spreizhülse so auszubilden, daß sie sicher am angrenzenden Schaftteil beim Einschlagen in ein Bohrloch anliegt.The invention has for its object to design the expansion sleeve designed as a spring sleeve so that it rests securely on the adjacent shaft part when driving into a borehole.

Die Lösung dieser Aufgabe wird durch die im Hauptanspruch angegebenen Merkmale erhalten. An der Spreizhülse sind nach innen abgewinkelte Laschen ausgebildet, die beim Einschlagen des Befestigungselements an einer Schulter des Schaftes sicher anliegen. Die Spreizhülse wird durch die nach innen gebogenen Laschen in diesem Bereich verjüngt, wodurch sichergestellt ist, daß auch bei unregelmäßig verlaufenden Bohrlöchern die Spreizhülse nicht über den angrenzenden Schulterbereich des Schaf­tes übergreift. Weiterhin haben die nach innen gebogenen Laschen den Vorteil, daß die Spreizhülse sich beim Einschlagen aufgrund der an den Laschen angreifenden Kräfte nach außen auszubuchten versucht, wo­durch eine bessere Verspannung zwischen Spreizhülse und Bohrlochwan­ dung erreicht wird. Gleichzeitig wird dadurch die Spreizhülse beim Einschlagen in das Bohrloch besser zentriert, so daß auch dadurch ein unerwünschtes Übergreifen der Spreizhülse über den Schulterbereich des Schaftes sicher vermieden wird.This object is achieved by the features specified in the main claim. Inwardly angled tabs are formed on the expansion sleeve, which rest securely on a shoulder of the shaft when the fastening element is driven in. The expansion sleeve is tapered in this area by the inwardly bent tabs, which ensures that the expansion sleeve does not overlap over the adjacent shoulder area of the shaft, even in the case of irregularly extending drill holes. Furthermore, the inwardly bent tabs have the advantage that the expansion sleeve tries to bulge outwards when driven in due to the forces acting on the tabs, as a result of which better tensioning between the expansion sleeve and the borehole wall is achieved. At the same time, the expansion sleeve is thereby better centered when it is driven into the borehole, so that an undesired overlapping of the expansion sleeve over the shoulder region of the shaft is thereby also avoided.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung darge­stellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail below with reference to an embodiment shown in the drawing.

Es eigen:

  • Figur 1 ein Befestigungselement mit Spreizhülse,
  • Figur 2 einen Längsschnitt durch die in Figur 1 verwendete Spreizhülse und
  • Figur 3 eine Seitenansicht der in Figur 1 verwendeten Spreiz­hülse.
It own:
  • FIG. 1 shows a fastening element with an expanding sleeve,
  • Figure 2 shows a longitudinal section through the expansion sleeve used in Figure 1 and
  • Figure 3 is a side view of the expansion sleeve used in Figure 1.

Das in Figur 1 dargestellte Befestigungselement besteht aus einem Schaft 1, der an seinem hinteren Ende einen Gewindeabschnitt 2 zum Festspannen eines Gegenstandes aufweist und im vorderen Bereich ei­nen abgesetzten Abschnitt 3 hat, an den sich zum Ende hin ein Spreiz­konus 4 anschließt. Im abgesetzten bzw. verjüngten Abschnitt 3 ist eine aus Federstahl bestehende Spreizhülse 5 aufgesetzt, die mit ra­dialem und axialem Spiel diesen Abschnitt 3 umschließt. Zwischen Spreizhülse 5 und dem verjüngten Abschnitt 3 besteht ein Freiraum 6.The fastening element shown in FIG. 1 consists of a shaft 1 which has a threaded section 2 at its rear end for clamping an object and has a stepped section 3 in the front area, to which an expansion cone 4 adjoins at the end. In the offset or tapered section 3, an expansion sleeve 5 made of spring steel is placed, which surrounds this section 3 with radial and axial play. There is a free space 6 between the expansion sleeve 5 and the tapered section 3.

Die Spreizhülse 5 besitzt auf der in Figur 1 dargestellten Seite ei­nen durchgehenden Längsschlitz 7, der ein federelastisches Zusammen­drücken der Spreizhülse 5 zuläßt.The expansion sleeve 5 has on the side shown in Figure 1 a continuous longitudinal slot 7, which allows a spring-elastic compression of the expansion sleeve 5.

In Figur 2 ist der vollständige Längsschnitt der in Figur 1 darge­stellten Spreizhülse 5 gezeigt. Am unteren Ende besitzt die Spreiz­ hülse 5 zwei gegenüberliegende, nach innen gebogene Laschen 8, 9, die an einer Schulter 10 des Schaftes 1 anliegen. An der in Figur 1 nicht sichtbaren Rückseite der Spreizhülse 5 steht nach außen ein Steg 11 ab, der eine zusätzliche Rutschsicherung im Bohrloch dar­stellt. Mit der abstehenden Kante des Steges 11 kann dieser in die Bohrlochwand wie ein Widerhaken eingreifen, so daß die Spreizhülse 5 sicher im Bohrloch gehalten wird.FIG. 2 shows the complete longitudinal section of the expansion sleeve 5 shown in FIG. 1. The spread has at the lower end sleeve 5 two opposite, inwardly bent tabs 8, 9, which abut a shoulder 10 of the shaft 1. On the rear side of the expansion sleeve 5, which is not visible in FIG. With the protruding edge of the web 11, this can engage in the borehole wall like a barb, so that the expansion sleeve 5 is held securely in the borehole.

Wie in Figur 2 ersichtlich ist, besitzt die Spreizhülse 5 an ihrer Rückseite einen Schlitz 12, der ebenso wie der Längsschlitz 7 ein Aufspreizen der Spreizhülse 5 im Bereich des Spreizkonus 4 zuläßt. Das Aufspreizen der Spreizhülse 5 wird durch Einziehen des Spreiz­konus 4 in die Spreizhülse 5 erreicht. Dies geschieht beispielswei­se dadurch, daß auf den Gewindeabschnitt 2, der aus der Bohrlochöff­nung herausragt, zunächst ein zu befestigender Gegenstand mit einer Bohrung aufgesetzt wird und dann eine Schraubenmutter aufgeschraubt und angezogen wird. Dabei wird der Spreizkonus 4 nach unten gezogen, während die Spreizhülse 5 ortsfest im Bohrloch verspannt ist. Je stär­ker die Schraubenmutter angezogen wird, desto weiter wird der Spreiz­konus 4 nach unten in die Spreizhülse 5 gezogen, so daß eine ent­sprechend starke Aufspreizung der Spreizhülse 5 erreicht wird. Durch die Aufspreizung der Spreizhülse 5 wird eine sichere Befestigung des Befestigungselements im Bohrloch erreicht, welches hohen Zugbela­stungen standhält.As can be seen in FIG. 2, the expansion sleeve 5 has a slot 12 on its rear side, which, like the longitudinal slot 7, allows the expansion sleeve 5 to be expanded in the region of the expansion cone 4. The expansion sleeve 5 is spread apart by pulling the expansion cone 4 into the expansion sleeve 5. This is done, for example, by first placing an object to be fastened with a hole on the threaded section 2, which protrudes from the borehole opening, and then screwing and tightening a screw nut. The expansion cone 4 is pulled downwards, while the expansion sleeve 5 is clamped stationary in the borehole. The more the screw nut is tightened, the further the expansion cone 4 is pulled down into the expansion sleeve 5, so that a correspondingly large expansion of the expansion sleeve 5 is achieved. By spreading the expansion sleeve 5 a secure attachment of the fastener is achieved in the borehole, which withstands high tensile loads.

Claims (2)

1. Befestigungselement mit Spreizhülse zur selbstklemmenden Befesti­gung in Bohrlöchern, bestehend aus einem Schaft mit einem Gewin­deabschnitt oder einer entsprechenden Einrichtung zur Befestigung eines Gegenstandes und mit einem am Ende angeordneten Spreizkonus, der in einen verjüngten Abschnitt des Schaftes übergeht, an wel­chem eine als Federhülse ausgebildete Spreizhülse angeordnet ist, die im unbelasteten Zustand einen größeren Außendurchmesser auf­weist als der Schaftdurchmesser, dadurch gekenn­zeichnet, daß die Spreizhülse (5) an ihrer dem Spreizko­nus abgewandten Seite nach innen unter stumpfem Winkel abgewin­kelte Laschen (8, 9) hat, deren stirnseitige Ränder gegen eine Schulter (10) gerichtet sind, die den Übergang zwischen dem ver­jüngten Abschnitt (3) und dem Schaft (1) bildet.1. Fastening element with expansion sleeve for self-clamping attachment in boreholes, consisting of a shaft with a threaded section or a corresponding device for fastening an object and with an expansion cone arranged at the end, which merges into a tapered section of the shaft on which an expansion sleeve designed as a spring sleeve is arranged, which in the unloaded state has a larger outer diameter than the shaft diameter, characterized in that the expansion sleeve (5) on its side facing away from the expansion cone has inwardly angled tabs (8, 9), the front edges of which against a shoulder (10) are directed, which forms the transition between the tapered section (3) and the shaft (1). 2. Befestigungselement nach Anspruch 1, dadurch gekenn­zeichnet, daß zwischen den Laschen (8, 9) wenigstens ein an der Spreizhülse (5) angeformter Steg (11) nach außen absteht.2. Fastening element according to claim 1, characterized in that between the tabs (8, 9) at least one on the expansion sleeve (5) integrally formed web (11) protrudes outwards.
EP89105407A 1988-05-24 1989-03-28 Fastener with an expanding sleeve Expired - Lifetime EP0343342B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89105407T ATE68854T1 (en) 1988-05-24 1989-03-28 FASTENING ELEMENT WITH EXPANDING SLEEVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3817512 1988-05-24
DE3817512A DE3817512A1 (en) 1988-05-24 1988-05-24 FASTENING ELEMENT WITH SPREADING SLEEVE

Publications (2)

Publication Number Publication Date
EP0343342A1 true EP0343342A1 (en) 1989-11-29
EP0343342B1 EP0343342B1 (en) 1991-10-23

Family

ID=6354964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105407A Expired - Lifetime EP0343342B1 (en) 1988-05-24 1989-03-28 Fastener with an expanding sleeve

Country Status (7)

Country Link
EP (1) EP0343342B1 (en)
JP (1) JPH0637882B2 (en)
AT (1) ATE68854T1 (en)
BR (1) BR8902374A (en)
DE (2) DE3817512A1 (en)
DK (1) DK168800B1 (en)
ES (1) ES2027809T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107687470A (en) * 2017-08-18 2018-02-13 安徽信息工程学院 A kind of antitheft antidetonation setscrew

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306869C2 (en) * 1993-03-05 2002-01-24 Toge Duebel A Gerhard Kg Fastening device for fixing in a hole in solid material, in particular concrete
DE19531693A1 (en) * 1995-08-29 1997-03-06 Toge Duebel A Gerhard Gmbh Fastening element with anchor bolt and clamping wedge
DE29517805U1 (en) * 1995-11-10 1996-01-04 Upat Gmbh & Co, 79312 Emmendingen Fastener for driving into a borehole
DE29813932U1 (en) * 1998-08-04 1999-12-09 fischerwerke Artur Fischer GmbH & Co. KG, 72178 Waldachtal Expansion anchor
DE19936090A1 (en) * 1999-07-30 2001-02-01 Fischer Artur Werke Gmbh Metal fastener
DE102007058772A1 (en) 2007-12-06 2009-06-10 Fischerwerke Gmbh & Co. Kg Anchor and assembly tool for the anchor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3303602A1 (en) * 1983-02-03 1984-08-09 Upat Gmbh & Co, 7830 Emmendingen FLAG ANCHOR
DE3502607A1 (en) * 1985-01-26 1986-07-31 Wolfgang 7000 Stuttgart Kreikler Anchor, in particular load-dependent dowel
DE3526784A1 (en) * 1985-06-29 1987-01-08 Fischer Artur Werke Gmbh FASTENING ELEMENT WITH SPREADING SLEEVE
US4773803A (en) * 1985-12-12 1988-09-27 Hilti Aktiengesellschaft Expansion dowel assembly with extension on expansion member

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448651A (en) * 1967-06-02 1969-06-10 Usm Corp Expansion bolts
DE2161224A1 (en) * 1971-12-09 1973-06-20 Roy Seetaram Captive fastening element
FR2351298A1 (en) * 1976-05-11 1977-12-09 Prospection & Inventions Self expanding anchor bolt - has locking device shaped to ensure contraction of anchoring section
JPS53143964U (en) * 1977-04-19 1978-11-13
DE8506519U1 (en) * 1985-03-07 1985-05-09 Schneider, Josef, 7465 Geislingen Anchor bolts
JPS6218413U (en) * 1985-07-17 1987-02-03

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3303602A1 (en) * 1983-02-03 1984-08-09 Upat Gmbh & Co, 7830 Emmendingen FLAG ANCHOR
DE3502607A1 (en) * 1985-01-26 1986-07-31 Wolfgang 7000 Stuttgart Kreikler Anchor, in particular load-dependent dowel
DE3526784A1 (en) * 1985-06-29 1987-01-08 Fischer Artur Werke Gmbh FASTENING ELEMENT WITH SPREADING SLEEVE
US4773803A (en) * 1985-12-12 1988-09-27 Hilti Aktiengesellschaft Expansion dowel assembly with extension on expansion member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107687470A (en) * 2017-08-18 2018-02-13 安徽信息工程学院 A kind of antitheft antidetonation setscrew

Also Published As

Publication number Publication date
JPH0211905A (en) 1990-01-17
EP0343342B1 (en) 1991-10-23
DE3817512A1 (en) 1989-12-07
ATE68854T1 (en) 1991-11-15
DK168800B1 (en) 1994-06-13
ES2027809T3 (en) 1992-06-16
DE58900396D1 (en) 1991-11-28
JPH0637882B2 (en) 1994-05-18
DK165689A (en) 1989-11-25
BR8902374A (en) 1990-01-16
DK165689D0 (en) 1989-04-06

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